TiO2-CoxOy composite nanotube arrays via one step electrochemical anodization for visible light-induced photocatalytic reaction

Marek Kobylański , Paweł Mazierski , Anna Malankowska , Magdalena Kozak , Magdalena Diak , Michał Winiarski , Tomasz Klimczuk , Wojciech Lisowski , Grzegorz Nowaczyk , Adriana Zaleska-Medynska

Abstract

TiO2eCoxOy (x=1, y=1 or x=3, y=4) composite photocatalysts have been synthesized via one step anodic anodization of TiCo alloys. The effects of the cobalt content in the alloy (5, 10 and 15 wt%), water content (2, 5 and 10%) in the electrolyte solution, and applied voltage (30, 40 and 50 V) during the anodization process on the morphology and surface properties. Additionally, the dependence of cobalt content in the nanotubes (0.06–0.09 at. %) on photocatalytic properties of the obtained materials have been investigated systematically. It was shown that the amount of cobalt in the TiCo alloy affected morphology as well as photocatalytic activity of obtained composites. Moreover, the diameter and wall thickness of the TiO2eCoxOy composites could be precisely controlled by applied voltage value, water content in electrolyte and cobalt content in the working electrode. The TiO2eCoxOy composite nanotubes exhibit enhanced photocatalytic degradation rate of 0.444 μmol·dm−3·min−1 for phenol under visible light compared with unmodified TiO2 NTs 0.140 μmol·dm−3·min−1. XPS analysis revealed that the content of Co species in the surface layer of nanotubes is similar (from 0.06 to 0.09 at.%), independently on cobalt amount in used substrate, due to leakage of Co ions to the electrolyte during anodic oxidation. Phenol degradation in the presence of scavengers shown that the superoxide radical species O2 •− were found to be main active species responsible for high efficiency of degradation.
Author Marek Kobylański (FCh / DET / LPh)
Marek Kobylański ,,
- Laboratory of Photocatalysis
, Paweł Mazierski (FCh / DET / LPh)
Paweł Mazierski ,,
- Laboratory of Photocatalysis
, Anna Malankowska (FCh / DET / LPh)
Anna Malankowska,,
- Laboratory of Photocatalysis
, Magdalena Kozak (FCh / DET / LPh)
Magdalena Kozak ,,
- Laboratory of Photocatalysis
, Magdalena Diak (FCh / DET / LPh)
Magdalena Diak,,
- Laboratory of Photocatalysis
, Michał Winiarski
Michał Winiarski,,
-
, Tomasz Klimczuk
Tomasz Klimczuk,,
-
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Grzegorz Nowaczyk
Grzegorz Nowaczyk,,
-
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
Journal seriesSurfaces and Interfaces, ISSN 2468-0230, (0 pkt)
Issue year2018
Vol12
Pages179-189
Publication size in sheets1.5
Keywords in English heterogeneous photocatalysis, nanotubes, anodic oxidation, TiO2-CoxOy composite
DOIDOI:10.1016/j.surfin.2018.06.001
URL https://doi.org/10.1016/j.surfin.2018.06.001
Languageen angielski
Score (nominal)5
ScoreMinisterial score = 0.0, 20-07-2018, ArticleFromJournal
Ministerial score (2013-2016) = 5.0, 20-07-2018, ArticleFromJournal - czasopismo zagraniczne spoza list
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